James D Godfrey

US Patent:

41468520, Mar 27, 1979

Filed:

Sep 19, 1977

Appl. No.:

5/834077

Inventors:

James T. Godfrey - Columbia MD
Carl E. Nothnick - Pasadena MD
Robert A. Moore - Arnold MD

Assignee:

Westinghouse Electric Corp. - Pittsburgh PA

International Classification:

H03H 926
H03H 932
H03H 904
H01L 4110

US Classification:

333195

Abstract:

An acoustic surface wave signal transmission device includes a medium having a surface suitable for propagating acoustic energy or waves and having a first impedance characteristic. The surface of the medium includes an array of periodic discontinuities of a second impedance characteristic. The widths of the discontinuities vary in a predetermined manner to reflect a portion of said acoustic energy in proportion to the widths of the discontinuities. A transmitting transducer on said surface converts an input electrical signal into corresponding acoustic energy or waves and launches the energy or waves on said medium toward said array of discontinuities. The acoustic energy is reflected from said array of discontinuities toward a receiving transducer which converts the reflected acoustic energy or waves into a corresponding electrical signal.